does anyone know if the items earned from events will remain unlocked when erasing tray files?

im talking about the new thing that the sims4 team has been doing where there's the event that goes on (bubble to the top left) where it sends you different missions you can participate in. when the event is over, are the items you unlocked from the events still you unlocked and can still be purchased from the store even when you delete your game save files? does anyone know what i'm talking about?